St Charles Weather Forecast

    • 55
    • 72

    Chance Rain Showers

    • 55
    • 71

    Chance Thunderstorms

    • 58
    • 74

    Chance Rain Showers

    • 59
    • 77

    Slight Chance Thunderstorms

    • 54
    • 77

    Slight Chance Thunderstorms

    • 52
    • 71

    Mostly Sunny

Today 18 Sep Cuming

Partly sunny Early, then becoming mostly cloudy. A slight chance of Showers and Thunderstorms. Highs in the lower 70s. Southwest Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 18 Sep Cuming

Mostly cloudy. A slight chance of Showers and Thunderstorms in the evening. Lows in the mid 50s. Southwest Winds 5 to 10 Mph, becoming west after midnight. Chance of rain 20 percent.

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St Charles Temperature Statistics

September Temperature

Fremont Municipal Airport (26.1 miles)

  • Lowest 6 September, 2025

    42.8 °F

  • Average September

    68.8 °F

  • Highest 13 September, 2025

    94.6 °F

Climate (2020–Present)

Fremont Municipal Airport (26.1 miles)

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  • Average Low 2020–2025

    42.2 °F

  • Average 2020–2025

    53.3 °F

  • Average High 2020–2025

    64.4 °F
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